Answer:

The mass of an object is the amount of matter in it. Mass is measured in grams, kilograms and tones in metric units and in ounces, pounds, stones, hundredweights and tons in imperial units.

In everyday usage, mass is more commonly referred to as weight, but in physics and engineering, weight means the strength of the gravitational pull on the object; that is, how heavy it is, measured in units of force.